Hebrews 12:27

12:27 Now this phrase “once more” indicates the removal of what is shaken, that is, of created things, so that what is unshaken may remain.

Hebrews 12:26

12:26 Then his voice shook the earth, but now he has promised, “I will once more shake not only the earth but heaven too.” ¹ 

¹ sn A quotation from Hag 2:6.